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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0c7078364cdd0e2cc5aa7e7250dbb2e82947139d41d91c6e4ae6fddcceebb6' 
  AND token = 'v7v7KupBl+e5EOkILvfGjd8FqQ3daAKFHdplF+kqu7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}